import axios from 'axios'
import {MessageBox, Message, Loading} from 'element-ui'
import store from '@/store'
import {getToken} from '@/utils/auth'

// create an axios instance
// 单例
const service = axios.create({
  // 基准路径
  // env环境变量
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 20000 // request timeout
})

let loadingInstance

// request interceptor 请求拦截器
service.interceptors.request.use(
  config => {
    // loading
    loadingInstance = Loading.service({
      fullscreen: true,
      text: '请求加载中',
      spinner: 'el-icon-loading',
      background: 'rgba(0,0,0,0.7)'
    });
    // 全局配置token
    // 请求发送正常
    // do something before request is sent

    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['X-Token'] = getToken()
      config.headers.AUTHOR = 'wer'
    }
    return config
  },
  // 接口发送异常
  error => {
    // do something with request error
    console.log(error) // for debug
    return Promise.reject(error)
  }
)

// response interceptor 响应拦截器
service.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
   */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    // 移除loading
    loadingInstance.close();
    const res = response.data

    // if the custom code is not 20000, it is judged as an error.
    if (res.code === 200) return res;
    Message({
      message: res.msg || 'Error',
      type: 'error',
      duration: 5 * 1000
    })
    // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
    if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
      // to re-login
      MessageBox.confirm('您已经退出登录，您可以选择停留在此页面，或者重新登陆', '确认注销', {
        confirmButtonText: '重新登录',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        // 重新登录，重置token，重载页面
        store.dispatch('user/resetToken').then(() => {
          location.reload()
        })
      })
    }
    return Promise.reject(new Error(res.message || 'Error'))
  },
  /**
   * 接口没有响应的调用，例如跨域、404
   * @param error
   * @returns {Promise<never>}
   */
  error => {
    // 移除loading
    loadingInstance.close();
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service
